cast-iron

a cast-iron promise or arrangement is one that can be trusted completely (always before noun) No new business comes with a cast-iron guarantee of success.

Common Names:

Name	Pronounced	Usage
Ismahel	-	Biblical Latin
Iucunda	-	Late Roman
Akachi	-	Western African, Igbo
Agaue	-	Greek Mythology
Machlah	-	Biblical Hebrew
SinÉAd	shi-NAYD	Irish